Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8cd51daa9c7c717…

MALICIOUS

PDF

83.6 KB Created: 2021-03-18 07:33:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1b1c876318692c81cf5f693dd48b1647 SHA-1: ae9c15db5a939db6d09eb91f8850d2d70e107ff6 SHA-256: e8cd51daa9c7c717083e96cb79ed76c3e30249abcd47c536ce9336820144a2d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many of which point to disposable domains and are likely used for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to create a network of potentially malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://golowaki.ru/wix?keyword=free+clarinet+etudes+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446633/normal_6005292ed79e6.pdfIn PDF document text
    • http://emirofficialzm.com/33312197494db639.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/pay_slip_download.pdfIn PDF document text
    • http://in-step.shop/xapirulorosakevebasuep32x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457011/normal_5fc5b4f59e805.pdfIn PDF document text
    • http://xekalabaxuv.medianewsonline.com/gym_exercises.pdfIn PDF document text
    • http://lnstagramcopyrighthelps.com/972160814348vlv7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405902/normal_60146899986e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468531/normal_604781c1c4091.pdfIn PDF document text
    • http://wogizejelalod.iblogger.org/falls_risk_assessment_template_nz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383930/normal_60145c1842387.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385427/normal_5ff23fc047ce2.pdfIn PDF document text
    • http://instapodarok.site/which_language_is_easy_to_learn_php_or_pythonc85up.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451227/normal_6008626e26761.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/bojorabepogogupuxifivr81os.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lewabebobi.rf.gd/99617591107.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/40161394361.pdfIn PDF document text
    • http://bewaxibazo.epizy.com/what_is_the_remote_code_for_a_onn_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/28421222060.pdfIn PDF document text
    • http://toterow.rf.gd/84071778065.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/kudozazozepubogimi.pdfIn PDF document text
    • http://kagufunoziwezu.epizy.com/miborewatelikevuratepituf.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/xforce_keygen_32bits_autocad_2016_free.pdfIn PDF document text
    • http://safedoguno.onlinewebshop.net/social_psychology_elliot_aronson_download.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/ms_project_2019_for_mac.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C6 5104 bytes
SHA-256: 1e100cea4ed5dd89d35ab4bf026e4af5d15cb951411682f20f276e2d3225cc8b
font_01_sfnt_off00010536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10536 11908 bytes
SHA-256: e2ed5df198a9cf729931f6825f82bb415081b358fd10bc5c970ca0016b15cb52
font_02_sfnt_off00012b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5B 16120 bytes
SHA-256: 73e2bae015806fcbcea00a5e77fef36cf57312733aebee32ba98308b5ce41d75